<template>
 <div class="login_container">
     <div class="login_box">
         <!-- 头像区域 -->
         <div class="avatar_box">
             <img src="../assets/logo.png" alt="">
         </div>
         <!-- 登入表单区域 -->  
         <el-form ref="loginFormRef" :model="loginForm" :rules="rules" label-width="0" class="login_form">
             <!-- 用户名 -->
            <el-form-item prop="username">
                <el-input v-model="loginForm.username" prefix-icon="iconfont icon-icon-username"  placeholder="用户名"></el-input>
            </el-form-item>

            <!-- 密码 -->
            <el-form-item prop="password">
                <el-input v-model="loginForm.password" prefix-icon="iconfont icon-password-b" type="password" placeholder="密码"></el-input>
            </el-form-item>

            <!-- 按钮 -->
            <el-form-item  class="btns">
                <el-button type="primary" @click="login">登入</el-button>
                <el-button type="info" @click="reset">重置</el-button>
            </el-form-item>
         </el-form>
     </div>
 </div>
</template>

<script>
export default {
  data() {
    return {
      loginForm: {
        username: "admin",
        password: "123456"
      },
      rules: {
        username: [
          { required: true, message: "用户名不能为空", trigger: "blur" },
          {
            min: 3,
            max: 10,
            message: "用户名长度为3到10个字符",
            trigger: "blur"
          }
        ],
        password: [
          { required: true, message: "密码不能为空", trigger: "blur" },
          { min: 6, max: 15, message: "密码长度为6到15个字符", trigger: "blur" }
        ]
      }
    };
  },
  methods: {
    reset() {
      this.$refs.loginFormRef.resetFields();
    },
    login() {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return;
        //发送请求
        const { data:res } = await this.$http.post("login", this.loginForm);
        if (res.meta.status != 200) return this.$message.error('登入失败');
        this.$message.success(res.meta.msg);
        //将登入成功之后的token,保存到客户端的 sessionStorage中
        window.sessionStorage.setItem('token',res.data.token)
        //通过编程式导航跳转到后台主页
        this.$router.push('/home')
      });
    }
  }
};
</script>
<style lang="less" scoped>
.login_container {
  position: relative;
  background-color: #2b4b6b;
  height: 100%;

  .login_box {
    width: 450px;
    height: 300px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    border-radius: 3px;

    .avatar_box {
      width: 130px;
      height: 130px;
      padding: 10px;
      border: 1px solid #eee;
      border-radius: 50%;
      overflow: hidden;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
  }
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 10px;
  box-sizing: border-box;
}
.btns {
  display: flex;
  justify-content: flex-end;
}
</style>
